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B7 Sedan · Avant
Audi A4 · Sedan · Avant · 2004–2008
Facelifted B6 with the FSI turbo four and the RS4 V8.
Production run
2004–2008
Engines covered
6
Avg. part price
—
19902026
Interactive systems map
Inspect the B7
Tap a hotspot to inspect that system
Systems map
Where it goes wrong
Each numbered hotspot counts the documented failure points in that area. Select one to see the specifics for this chassis and engine.
Failure points by system
Engine7
Cooling1
Intake3
Fuel2
Exhaust2
Documented issues per engine
51.8T
52.0T FSI
4ASN
44.2 V8
52.0 TDI
53.0 TDI
Known weak points
What breaks on the B7
Timing belt interval is criticalDiagnose →Oil sludge on neglected 1.8T (small oil pickup)Diagnose →Cam follower wear on the HPFPDiagnose →Diverter valve failureDiagnose →Timing chain tensioners at the rearDiagnose →Oil consumptionDiagnose →Timing chain tensioners (front-of-engine job)Diagnose →Carbon buildup on FSI versionsDiagnose →PD injector loom and cam wear (PD era)Diagnose →DPF cloggingDiagnose →Swirl flap motorDiagnose →EGR coolerDiagnose →
Guides & playbooks
B7 playbooks
Maintenance scheduleGive me a mileage-based maintenance schedule for a Audi A4 B7, including the items the factory schedule skips.Buyer's inspectionI'm inspecting a used Audi A4 B7. What exactly should I check, test drive and look for underneath?Build planPlan a staged performance build for a Audi A4 B7 that stays reliable as a daily driver.Fault code lookupI have a fault code on my Audi A4 B7. Walk me through what it means and how to confirm the cause.
Fits your B7
Parts & tools
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